You ought to take it to a bike shop with a bearing press--bearings need a moderate amount of force to be fully seated, and if done by hand they often end up not being perfectly parallel to each other. If you really don't want to have someone else do it you can loosen your stem's steerer clamp, add a 5mm spacer, and tighten down your top cap very slowly to pull it all together--the fork and cone spacer will act as your headset press.

The lower bearings in my Caad 9 do not extend down like that. The top bearing may extend a little above the HT, but the cap is designed to cover that. That said, I don't think the upper bearing extends as much as yours.

With the original top cap there was a gap of about 0.5mm-1mm between it and the head tube. I can't use a top cap now because I snagged a Slice Si fork but the steerer length means there's no space for a normal cover. I have ordered a SlamThatStem cover.

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